EDIT: I would still buy, It’s been over 6 months now (EDIT: about 6+ months in and the nylon chain cover has become detached from one end of the chain. It’s not a huge deal or very noticeable at all and can be glued back in easily. Highly recommend for people who don’t want to #1 overpay for a lock, 2 you’re in a large city or on campus and NEED a warranty if you’re parking in unsafe areas often Kryptonite has warranties but I don’t live in a large city and don’t park my bike on university campuses or downtown often and have faith in this chain. I would maybe bring extra locks if I did go downtown just in case for front wheel but the 12” chains are an excelllllent size for preventing thieves from snapping the lock as easily for a great price. Also I love the key feature. It works great and has a backup. Unless you come across a lock picking expert or someone with a giant saw you’re pretty safe imo. The locking mechanism is great and so simple to use. It unlocks very easily with just a twist. The lock cover is great for dirt and debris but I usually wear my lock cover easily around my shoulder or waist or sometimes my bicycle it’s not too heavy and a perfect length to lock my frame and rear tire. It’s also quite thick to deter any thieves, encased in nylon which prevents any scratching, and another deterrent (edit: one side of the nylon has detached but not the end of the world). I would definitely buy this again. It’s not too big take Carrie and not too small to not deter a criminal. It’s perfect compared to the insane price of some locks. Some of those lock costs 10-15% of my bicycle.
I also recommend buying an apple AirTag hidden, cheaper combo than many kryptonite locks. 80-90% of bicycles are never recovered.

Cute 😍 daughter loves the color and how strong it feels besides her anti-theft alarm this locker is extra security and can cut eith bolt cutters

I liked this 10mm thick chain lock, it's easy to open and lock. It worked great for awhile until today when I try to unlock the bike, the lock isn't unlocking doesn't matter how I turn the key and the key won't twist and the lock won't unlock as many times as I tried. The protective cloth detached from one end of the lock. And the plastic case of the lock came loose that might contribute the cause of malfunction lock. Glad I finally shake it to work but I have to be like this every time when I try to lock and unlock the lock. I hope you can rethink the design and come to a conclusion why that might happend.

This chain is heavy, and feels very capable. The build quality is excellent. The locking mechanism is very easy to use. When placing the lock, it simply clicks into place and the key automatically turns for instant removal. The key fits and turns with ease. I'm very satisfied with this purchase.

Let's face it, no lock can stop a determined thief. But this lock will certainly cause him to look for easier pickings. It is very heavy and I love how the key works easily.

I had it on my bike two weeks and it broke, now key won’t come out,
Update!!! They sent a replacement for free!!!

The bike lock is excellent and long enough for my needs. I really like the feature that allows you to hide the keyhole for extra security. The material covering the chain feels thick and durable—it hasn’t torn yet. The brand name remains visible along the chain, and the key turns smoothly without getting stuck.
I also appreciate that the key cannot be removed unless the lock is fully secured, which prevents accidental unlocking.
Unfortunately, the plastic part under the connector broke when I accidentally dropped it. However, this doesn’t affect the lock’s overall performance.